Print Error Type when I catch it

[Jimbo]

Hello

I have a relatively simple question. I want to use a try except in a
function & when an error occurs I want to print the error type name(eg
IOError, OSError etc) do you know how I can do this without specifying
all possible errors, eg having to do this "except (IOError, OSError,
IndexError, ....):"

try:

... some code

except:
# Here I want to print type of error that occured
print errorType

The reason I want to do this is because one of my complex programs is
crashing BUT no python error message is comming up in red when I run
it, so I cant figure out what error occured? So I think its time I
learnt to print out my own errors & their types

 

[Chris Rebert]

I have a relatively simple question. I want to use a try except in a
function & when an error occurs I want to print the error type name(eg
IOError, OSError etc) do you know how I can do this without specifying
all possible errors, eg having to do this "except (IOError, OSError,
IndexError, ....):"

try:

   ... some code

except:
    # Here I want to print type of error that occured
    print errorType

The reason I want to do this is because one of my complex programs is
crashing BUT no python error message is comming up in red when I run
it, so I cant figure out what error occured? So I think its time I
learnt to print out my own errors & their types

try:
# code
except Exception as exc:
print type(exc).__name__

Cheers,
Chris

 

[Steven D'Aprano]

Hello

I have a relatively simple question. I want to use a try except in a
function & when an error occurs I want to print the error type name(eg
IOError, OSError etc) do you know how I can do this without specifying
all possible errors, eg having to do this "except (IOError, OSError,
IndexError, ....):"

try:

... some code

except:
# Here I want to print type of error that occured print errorType

As a general rule, bare excepts are terrible practice and should be
avoided.

At most, you should write:


try:
...
except Exception:
...

which will allow keyboard interrupts to continue to work correctly.

In Python 2.5 or 2.6, you can say:

try:
...
except Exception, e:
print e # prints the exception object
print type(e) # prints the type of exception
print type(e).__name__ # prints the type's name
raise # re-raise the error and get a traceback

In Python 2.6 you can also use

except Exception as e:

and in 3.x you *must* use the "as e" form.

The reason I want to do this is because one of my complex programs is
crashing

Perhaps you should aim to make them less complex? *wink*

BUT no python error message is comming up in red when I run it,

What do you mean, "crashing"? If you're not getting an exception raised,
and a printed traceback, how do you know it is crashing?

Do you mean it is dumping core? If so, then a try...except won't save you.

so I cant figure out what error occured? So I think its time I learnt to
print out my own errors & their types

The best way to print out errors is:

DO ABSOLUTELY NOTHING.

Python will automatically print out the errors, unless you suppress them
with a try...except. So stop suppressing them and let Python do what it
is supposed to do!